1 // Copyright Antony Polukhin, 2013-2020.
2
3 // Distributed under the Boost Software License, Version 1.0.
4 // (See the accompanying file LICENSE_1_0.txt
5 // or a copy at <http://www.boost.org/LICENSE_1_0.txt>.)
6
7 #include <boost/lexical_cast.hpp>
8 #include <string>
9 #include <cstdio>
10
11 #ifdef BOOST_MSVC
12 # pragma warning(disable: 4996) // `strerror` is not safe
13 #endif
14
15 //[lexical_cast_log_errno
16 //`The following example uses numeric data in a string expression:
17
18 void log_message(const std::string &);
19
log_errno(int yoko)20 void log_errno(int yoko)
21 {
22 log_message("Error " + boost::lexical_cast<std::string>(yoko) + ": " + strerror(yoko));
23 }
24
25 //] [/lexical_cast_log_errno]
26
27
28 //[lexical_cast_fixed_buffer
29 //`The following example converts some number and puts it to file:
30
number_to_file(int number,std::FILE * file)31 void number_to_file(int number, std::FILE* file)
32 {
33 typedef boost::array<char, 50> buf_t; // You can use std::array if your compiler supports it
34 buf_t buffer = boost::lexical_cast<buf_t>(number); // No dynamic memory allocation
35 std::fputs(buffer.begin(), file);
36 }
37
38 //] [/lexical_cast_fixed_buffer]
39
40 //[lexical_cast_substring_conversion
41 //`The following example takes part of the string and converts it to `int`:
42
convert_strings_part(const std::string & s,std::size_t pos,std::size_t n)43 int convert_strings_part(const std::string& s, std::size_t pos, std::size_t n)
44 {
45 return boost::lexical_cast<int>(s.data() + pos, n);
46 }
47
48 //] [/lexical_cast_substring_conversion]
49
log_message(const std::string &)50 void log_message(const std::string &) {}
51
main()52 int main()
53 {
54 return 0;
55 }
56
57